your best bet is to pull codes.Then fix the problem I believe when your crankshaft goes there no start anymore.You might have a cam sensor too.Which should make it run like ****.
Napa has a good code reader for mercedes,maybe they would pull codes for you.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt